foo.c: In function 'main':
foo.c:6:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
    6 |  for(i=0;i<=20;i++)
      |  ^~~
foo.c:8:10: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
    8 |          printf("%d",zhuan(x[i]));
      |          ^~~~~~
foo.c:8:29: warning: passing argument 1 of 'zhuan' makes pointer from integer without a cast [-Wint-conversion]
    8 |          printf("%d",zhuan(x[i]));
      |                            ~^~~
      |                             |
      |                             int
foo.c:2:16: note: expected 'int *' but argument is of type 'int'
    2 | int  zhuan(int a[]);
      |            ~~~~^~~
foo.c:8:29: warning: array subscript 21 is above array bounds of 'int[20]' [-Warray-bounds]
    8 |          printf("%d",zhuan(x[i]));
      |                            ~^~~
foo.c:5:6: note: while referencing 'x'
    5 | {int x[20],i;
      |      ^

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